Gannon has been given to about 6,682 people in the United States since 1880. It was most common in 2014, which makes it a millennial-parent name.
Its best year was 2014, when 751 babies were given the name, ranking 414th. The typical living American called Gannon is about 13 years old today. It is relatively most common in Indiana, where it accounts for 0.01% of births.
Source: US Social Security Administration, national and state name files, 2025 release. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.